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Message-ID: <alpine.LFD.0.9999.0711121034220.30499@woody.linux-foundation.org> Date: Mon, 12 Nov 2007 10:39:15 -0800 (PST) From: Linus Torvalds <torvalds@...ux-foundation.org> To: Alexey Dobriyan <adobriyan@...il.com> cc: mel@....ul.ie, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...r.kernel.org Subject: Re: Major mke2fs slowdown (reproducable, bisected) On Mon, 12 Nov 2007, Alexey Dobriyan wrote: > > Cross-compile farm here migrated to .ccache and build dir on separate > disks and now I have a way to blow up .ccache without waiting half an > hour for rm(1) to finish. It's called mke2fs(8). > > However, in e.g 2.6.24-rc2 mke2fs is amazingly slow if done right after > several fat cross-compile builds. Normally it takes ~11 seconds to > finish. After commit 5adc5be7cd1bcef6bb64f5255d2a33f20a3cf5be aka > "Bias the placement of kernel pages at lower PFNs" it takes several > minutes. 2.6.24-rc2 without this patch also gives normal mkfs speeds. > I'm pretty sure bisection wasn't screwed up. Can you (just to make sure) do a "git revert" of this commit on top of the current tree, and verify that that makes it all work fine again too? If so, let's just revert it. I just want to make sure that there isn't some subtle interaction with anything else in there. Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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